$10 is just $10, and it wouldnt hurt to see what kind of results it brought up. Good luck, nonetheless.
Instead of submitting to paid options, use the money to manually submit to free directories (provided that there submission should be made on unsubmitted sites)
In terms of online marketing you're just trying to get ahead of the competition to get the market share. You either have to have deeper pockets or be a lot smarter. I hope you've got Hawkings' IQ cos $10 isn't gonna stretch very far. Especially in travel. Try $10k a month.
you should have to contact some Directory Submission Service Provider for that they can submit your sites in $10 for some free directory. but in $10 they can submit 200 to 300 directory per month.
You can submit to around 4-5 directories with that amount. Some directories will only charge $1.99 or $2.99 per link.